R&B bad boy Bobby Brown is convinced he has no reason to be concerned about his daughter Bobbi Kristina's health amid allegations of her drug-taking, insisting he's aware of everything she does.The My Prerogative singer's only child with his late ex-wife Whitney Houston has been caught up in the occasional tabloid scandal in recent years, and was previously caught on camera snorting a mystery white powder, thought to be cocaine, during a party. The photos were published by the National Enquirer and further images of the teenager smoking what appeared to be marijuana from a bong emerged weeks after her mother's death. But, while former addict Brown admits he will "always be worried" about his kids getting mixed up in drugs, he is adamant 19-year-old Bobbi Kristina is doing just fine - and he has blamed erroneous gossip for the rumours. During a pre-taped interview on U.S. breakfast show Today, which aired on Thursday (03May12), he said, "I know what she is actually doing. I think people are, you know, making assumptions of what my daughter is and how strong she is. People tend to want to control strong-willed people. And that's what I see... "(But) right now, no, no, no (he has no reason to worry about drugs). I am her father. She talks to me about everything." Brown has another four kids from other relationships. Three of them - LaPrincia, Landon and Bobby, Jr. - joined their father on the show to dismiss accusations he's a bad dad. The grown-up Brown children insisted Bobby's wild man reputation is undeserved and he's a great father they can always count on.